Grinding mill door



ig- 20, 17935 R. L.. cAwooD y 2,011,675

GRINDING MILL DOOR Filed Oct. 13, 1933 3 Sheets-Sheet 1 a l'mnentor (Ittomeg Filed oct. 15, 193:5 3 sheets-sheet 2 Bg W ug. 20, 1935. R L CAWOQD 2,011,675

GRINDING MILL DOOR Filed Oct. 13, 1933 3 Sheets-Sheet 3 nllllllll Patentedv Aug. 20, r1935i RichardL.h Cawood, East Liverpool, Ohio I'This inventioni-relatesto an improvement in doors--forpebble ball or tube mills, of a character 'suchE that the `door may be either'lifted out or swung back on its hinges. Heretofore pebble mills rwould ordinarily be built with doors which may be "either lifted outor thrownbackon their hinges butfanydoo'r used wasnot' capable of both. movements. y This invention makesgpossiblefor use the .s'amel 'door for eitherY movement, .-thatl isto say, capable of being-lifted directly'offV of the'pebble mill orrswung backen' its hinges and heldrigidly to the pebble mill. f This. is made vpossible .by the character of hinges Vused for the door.

f Another feature of `the invention'relates to the Vbreaking of the seal'ofl'the door fromits vframe which visimade possible by a leverlhinged to the frame andhaving acam surface which engaged a lug on` the door forlifting thedoor and breaking fits seal Primarily, it was necessary to break the seal'with a crow-bar as pebble mill doors'stick very'-tightly after thepebble mill has been used, the.;gasket'r-a'dlieringV to theV frame. By swinging y.the lever, its cam breaks-thel seal `Very easily and fraises. the-door permitting it to be opened'. '-'In the accompanying drawings :j- Fig.{1 s a'perspectivevi'ew. of the door in its "open position;`

l: f{Fig...2 is a-detail perspective view of oneof the `-Fig. 3 is a-top. plan View ofthe doorclosed; v Fig. 4 is averticalsectional view on the line 4-4, of='Fig.=-.3; J i f `AFig`5 is a similar View showing the door open; w1 -"Fig.6'i's 'a perspective View showing the door belinglifted oi; f Y w" Fig. 7V isa vertical sectional View on the line, 21-"|ofFig. 3*;Jandf f i L Fig.=8` is asimilar'view on the line, 8-8,' of

The invention is shown as applied to' a pebble mill of a usual or well-known construction and designated generally by the numeral I.A The door `opening ofthe pebbletmill 4has `an upstanding -fram` 2,?securedvthereto as by 'rivets or'bolts 3. '-Ihe'frame` 2r haslupstanding lugs 4 with' openings 5 ther`ein to `receive the usual locking bar 6, for

the'doorq i y 4 Thedoor is designated generallyl, and'carries "a gasket 8, in positionto'tonto the top, edges of 'the frame 2 for sealing the door to the frame when the door is closed and locked tightly in place,- so

f Athatwhenxthe pebble mill I rotates in operation,

"' Application october 1s, 1933,1seria1 No. 693,495 @1s claims. (cazzo-31) -TELNT OFFICE N usual boss I to receive the inner end'of a set l screw Il threaded through the locking barf in 'order to effectively seal and'lock the door in a closed position. The opposite ends of the bar '6, engage in the openings 5, so that when the screw I Ilis turned to raise the bar 6 relative to the door, ythebarfbeing held against raising by the openings 5, the screw `forces the door downward into a tightly sealed relation with the upper edge lof the frame 2. 7

TheV frame 2 `has a pair of stationaryrhinge l5, having the hinge pins I projecting inwardly Atoward eachother- Each of the hingepinsI5 has flattened sides I1 spaced `apart a distance substantially equal or.

slightly less thanthe Width of the slot I4, so as t0 slip into or out-of the opening I3, throughthe slot I4 when the door is in a closed positionas represented in Figi 4. i Howeven by raising the forward edge of the door as in breaking the seal, the hinge pins I5 vdrop down into theopenings I3, and having curved opposite sides I8, they turn within the openings I3 permitting the` door to swing from the `position shown in Fig. 4 to the position shown in Fig. 5, where the door is held against further backward movement. by` engagement with the extrem .edges of the stationary bracketsIZ.

Howevenrwhen the door is in the position shown in Fig. 4, with the sides I1 vertical and approximately registering withthe4 sides of the slots I4, the doormay be lifted completely olf of the frame asshowninFigS." i

lInthat manner, the hinges of the door permit swinging of the door. on its hinges to the position shown in Figs. 1 and 5, or they permit complete 'removal of the door by being liftedfoutfof the frame as represented-inFig. 6, thereby providing fra universal door capable of either use, but when Itheidoor is swung back on its hinges, it cannot be accidentally displaced. I

. lWheni the forward edge of the door is lifted 'so as to start the hinging action, that turns the 'hinge pins I5 sulciently as represented in Fig. 2, `to lock said hingepinsin the openings I3, and

thereby` preventing accidental displacement of The brackets I6exses' n l unagainst the lug^2land raise; .the forward edge i mitting 4removal-of the door .for,closing-said` doorway; and having al jhjnge pin `on its hinges.

mill-has been used, the seal is noteasily broken so as to 'permit vtheop'ening of thefdoo'r.v 'To facilitate the breaking of the seal; this invention *utilizes a lever I9, havingafcam surface i 28 thereon .in positiongto engage under a,lug `2l, vcarriedijbhy. the door 4l-lin order toraise the. door and thereby break yits seal so as"'to"permit',the

door .to be opened.l The lever vlil is journaledx-,on a pivotypin 22, held in place by a` set screw `23 in a boss 2d carriedl by the frame 2. v

operative position, a spring-"" adapted to engage thegrooverin-theunderside.of

the handle `to restrain its turning movement.,

Theball is carried `bya small housing" 26 'at-r ,ri When itgiisgdesired .tobreak Iftheseal and.,open fthe.v door, the levens; swungffrcm the-.position shownfinFig: l,v around'vgtofthe vp@sinon.sllQwII.,irl -;Eig..6 ,xvvl1ich causesthe cam-surfacerv 20 [to bear ofvfthej door, thereby breaking, the seal-andlper;-v andpswinsing ofit ebackongits.hinges.....:f

. 'f i; 5.1.,'In a.;.mill.,' the combination witna-cylinder rhaving...a 'doorway .and frame. ftherefor,` of. -a Adoor thereon of; greaterll jwidth than; thickness, the

plane-ofthe width ofthe. pin extending'approx-f -lmately-,at a vrightangle relativeto theplane of .thedoorland .ajbracketi forreceiving the' pin vJnavinggat. slotlgthroughA/the .uppenside vthereof vpermittingbodily .removaltofthedocr when ,the

` `:.vvdth of theipin'is in alignment with vthe slot..

n In amill,.the combnationiwitha cylinder '.,fhavingfa :doorway and frame therefor, of a door for said doorway with means for 'sealingfsaid 'doorrfto` .the r'frame; and; means. ipivoted;y to the frame for movement insa-4 plane approximately .f .In a mill, i the r combination v.Wth1.1a. vcylinder k 50 @having.-a .doorway andA frame Itherefonnof a door..

forlsaid doorway :having meansyforgsealing said doorto theV frame when closed, and Aagrlever pivoted f upwardly againststhe doory and :break '.thexseal 3;,to. the* frame .forfmovement inaplane approximately. T parallelv -withi` the gframe for swinging movement.l relative thereto: tandl having .cam

;meansi at. thej'topl side .thereof in .position tov bear r.l11i-hereofwhen the leverris swung relative; lto .the

. y 4havinga 'doorwayiand frame `therefOLOf/a'door for saiddoorway having meansqforgsealing--the. esame :to `the, frame saidf door` havingy a forwardly fprojecting lug,r .carried thereby, v,a i lever pivoted ;to iithel frame for movementV in 'aa plan'efa'pprox- .imately .parallel{ with. the yframe f andrhaving a 4. cam bearing surface. underlying Vthe `lug whenv lthe :door is closedgforybearingzupwonzethe lug'and` breaking the seal of thedoor when.v the alever fis turned in one direction. l. i. al. a In a fmill, the.combinationof.'al frame'liaving La projecting bracket, .saidr ,brackethaving an ropening thereinv provdedawi-thafslotfthroughsone .isdethereof ,11a ,dooriearrying jathinge pin of great- 'fier vindt-hthan thicknessin crosssection; the width moval `when; the doorlisfopen. i

` y o v l 2,011,675@ the door in the course ofv its being swung back I of thehinge pin being turned approximately at right angles relative to the plane of the door, the slot in the lbracket being in registry with the *hinge pin when the door is in an approximately closed position.

f 6; In amill, the combination of a frame having.

a bracket, said bracket having an opening therein with a slot through the upper side of said opening of lesswidth lthanlthe width of the opening,

` and .a ,door for said frame carryingy a hinge pin 'o extending intox-.theopeninglsaid hinge vpin'being of greater width in cross 'section than the thickl' 'vness thereof, the thickness of the hinge pin approximately corresponding with the `'width .of the 'rslot-iforremoval of the hinge `pin through the In order to holdthe lever I 9Min itsznormally in- Y ""essed "ball" 25y is .slot,.the greater. Width of the hinge' pin extending a 'plane'approximately at right angles to the planelof'thedoor.L

'I'.y In amill, the combination of aframe having brackts-with openings therein, said openings .a doorrarrying hinge pinsfnormally received in .the openings'andach beingpf elongated Vcross- .section-with ,the greater width approximatelvat `rightfangles.to theplaneof .the` dooryto .pass ythrough .the yslot only Whengthe door.I is. approximately closed vandpreventing removal from the openingwhen vthedoorgis open. y In a mill, the combination of a frame having .bracketsata side .thereof each witha hinge open'- Singthereinghavinga slot;to.the topof the bracket,

a door-,carrying hinge Vpins ynormallyf.'received in the yopenings and eachbe-Ilg .ofgelongated crosssection with'the.,`greater width approximately at right-.angles tothe plane of thedoor-to pass `.tl'iroughf:the 'slot only ,when the door, is approxi- ,y mately closed and preventing removal from the opening when the.,doorsopen,.vand means for l .clampingthedoor to theframe yinelosed position preventing removal of the pins from the openings. 107.-. In acontainer., afdoor framelhaving a hinge opening therein with.r a :slot extending from-'said opening tothe top of the frame, a door having. a

being of elongated cross-section with .thcfgreater i width approximately atright-angles to theplfane fhinge pin. normally. vreceived in :the opening :and

1.1.1Ina container, a'door -frameiliaving hinge openings in VVa side thereof,'each having a-slot .ex- {tendingifrom theopeningto `the-top ofthe frame,

a door@ having yh-ingepins normally` received in lin the openingsand each being of elongated'cross.-

.section with the greaterv width approximately at v.rightangles to theV plane i of Lthegdoor' v:to 'pass [throught the slot'fwhen `the :door .is .approximately closed andv to prevent removal fwhenthe door is open.; l f

12.*'In-a container, a vdoor/frame havinghinge openings in a side thereof,eacli having .a `slot zextndin'g-from' the opening tov lthe top yof the `frame,` asdoorhaving hinge .pins normally 'received 35 in the openings and each being of elongated crosssection with the greater Width approximately at right-angles to the plane of the door to pass through the slot when the `door is approximately closed and to prevent removal when the `door is open, and means extending across said door and acting on opposite sides thereof for clamping the door closed.

13. In a mill, the combination of a frame having brackets at a side thereof each with a hinge opening therein having a slot to the top of the bracket,

a door carrying hinge pins normally received in the openings and each being of elongated crosssection with the greater Width approximately at right-angles to the plane of the door to pass through the slot only when the door is approximately closed and preventing removal from the opening when the door is open, and means extending across said door and acting on opposite sides thereof for clamping the door closed.

RICHARD L. CAWOOD. 

